I've been looking at baby swings and bouncers for newborns. However the current thinking is that a baby shouldn't spend more than 1 1/2 hours in a car seat because they're not lying flat, yet none of the baby swings or bouncers seem to lay flat. I was looking particularly at the Fisher Price® Babygear Flutterbyes Dream Swing. I can't see what the difference is to the baby sitting up in a swing or the baby sitting up in a car seat yet there's no warning on the swings that they're not to be used more than a certain amount of time. Anyone any advice?